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computer power supply with built in battery backup

mattbatt0

It has always annoyed me that uninteruptible power supplies convert AC into DC then back into AC so that the computer can convert the AC back in to DC.  I always wanted an ATX style power suply that only converted AC into DC once for powering the system and charging a backup battery.  I have thought about building it myself but I don't know what the pitfalls might be. 

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  • Hi Matt,

    The APC supplies are set up like this because desk top computers and monitors can not run directly off a single DC voltage.  The ATX power supply creates + and - 12 volts, + 5 volts, and perhaps + 3.3 volts. The monitor probably runs on yet another voltage and if you have any other accessories they may also have different voltage requirements. By having the APC turn its battery backup power back into 120 VAC the individual power supplies can do their jobs of producing all the different required voltages.

    John

  • in reply to jw0752

    Yes thank you I know that part.  They make 12 volt DC-DC power supplies for computers.  I want to avoid the power loss of conversion and only switch to DC once like a Laptop does.
    In searching I think I may have found some products that would fulfill my needs. 
    OpenUPS to regulate charging and pulling from Battery.  http://www.mini-box.com/OpenUPS?sc=8&category=981
    and this 250W DC-DC power supply to take the DC from the openUPS and step up and down for the PC.  http://www.mini-box.com/M4-ATX?sc=8&category=981
    Combine that with a LiPO battery pack and it's awesome.

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